1. When did the error pop up?
2. The sql file of your table. Sample data will be fine as long as it can reproduce the problem. (To dump the table, right-click it and choose Dump SQL File > Structure And Data)
3. Detailed steps to reproduce the problem. If possible, please provide a video.

Comment

The data is sensitive, so I am afraid you are not getting that. - I will see what I have that is non sensitive...
your points seem a little "Generic" without spotting the post content, perhaps

1) "When did the error pop up?" - as soon as "a search term (find) is put in before a (largish) table is completely loaded".
3) "Detailed steps" = A search term (find) is put in before a (largish - 76k rows) table is completely loaded ...
(largish= 76k rows or above)